21118420

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{179}}^1\times {\mathrm{347}}^1$

素因数の和:552

約数の個数: 48

約数和(自身を含む): 47355840

約数和(自身を除く): 26237420

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 179, 340, 347, 358, 694, 716, 895, 1388, 1735, 1790, 3043, 3470, 3580, 5899, 6086, 6940, 11798, 12172, 15215, 23596, 29495, 30430, 58990, 60860, 62113, 117980, 124226, 248452, 310565, 621130, 1055921, 1242260, 2111842, 4223684, 5279605, 10559210, 21118420]

約数ペア:

[(1, 21118420), (2, 10559210), (4, 5279605), (5, 4223684), (10, 2111842), (17, 1242260), (20, 1055921), (34, 621130), (68, 310565), (85, 248452), (170, 124226), (179, 117980), (340, 62113), (347, 60860), (358, 58990), (694, 30430), (716, 29495), (895, 23596), (1388, 15215), (1735, 12172), (1790, 11798), (3043, 6940), (3470, 6086), (3580, 5899)]